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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bff31ab2bae2894f4d1eab7d95cebffed5376494dcf418c5ef644117db1f8abc' 
  AND token = '9IgRQLR3oJ3nohq8NNta2cyYFZL89jcS+fwYE4S/zZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}